It was late (or early, depending on your outlook on the world) when I was joined by the boy who was living in the room next to mine, way back on the other side of the building. I can remember, although I'd had some drinks, sitting alone in my friend’s room on a single bed, the mattress overly springy and with a coarse plastic coating, attempting to stream a song over our dorm’s spotty Internet connection. The whole thing went down near the end of my freshman year at a party, at which people from the whole dorm floor were drunk and celebrating, carelessly streaming in and out of each other’s rooms, following the various different pop songs until one room took their fancy. I was at college, living in dorms, and the experience-aside from the usual horrifying awkwardness and somewhat spontaneity of the occasion-was completely and utterly unremarkable aside from one thing: the guy I slept with identified as straight. His wife wouldn't swallow and was unable to deep throat him so I was more than willing to provide him what he needed/desired for that delicious cum he provided.I was 19 when I first had full-on sex with another man. That particular guy became a regular I serviced for the next 6-8 months sucking him off 2-3 times a week.
Since that day I've always swallowed (a couple thousand blowjobs) as it truly is the perfect finish to a perfect blowjob. It's warmth was immediately felt against my tongue as the entire inside of my mouth was tingling being he provided a lot of cum for me to work around my mouth before swallowing it.
The texture of his cum had the perfect mix of thickness and slippery thin semen. So to answer your question: That moment you know its about to blow you feel his balls tensing up and his shaft gets raging hard as his silky, warm cum begins to squirt into your mouth providing me (the sucker) and him (the sucked) with an enormous amount of satisfaction. It did as I sucked another load out of that gorgeous cock which tasted even better than the first. He says "Your welcome to keep sucking it'll get hard again pretty quick". I smiled (while looking up at him) as I was smacking his cock against my tongue and stroking the base of his shaft and told him that was my first blowjob swallowing and I want more. We he calmed down I held his softening cock between my lips flicking my tongue all around it as he says "Damn dude, that was fabulous and you took it all". I was very proud of myself and his cum was delicious as I wanted more even though he provided a lot. After some 40 minutes of sucking his cock he announced he was about to cum so I cupped his balls and held about 4-5" of his cock in my mouth and felt the first warm squirt entering.He was groaning quite loud as I immediately swallowed and then his cock twitches and shoots another stream as I hold it and slowly keep sucking him and then a third & fourth spurt filling my mouth as I swallow that and deep throat him to feel yet a fifth spurt as I am now just holding the head of his cock between my lips and he is twitching and moaning as I feel even more cum oozing from his cock as I pull off to lick his shaft clean and squeeze every drop out that he can produce. I'm orally worshiping his cock and balls, taking my time as I'm getting a good taste of his pre-cum which was delicious so right then I knew I wanted him to cum in my mouth and swallow for him. I took that flaccid cock into my mouth as it began to grow within the warmth of my sloppy mouth and yes, it was a bit over 8" and a joy to be sucking on. I was immediately attracted to that cock and responded and within the hour I was in his living room, on my knees between his legs sucking his cock. I answered a married guys Craigslist add who was searching for a mouth to cum in and had a photo of a gorgeous cock looking to be about 8-8.5" long attached to the add. Well, for me it took me about ten blowjobs to about 6 different guys before I built up the courage to take a load in my mouth.